{"product_id":"carrier-upflow100u48m19a-transformer-h3hvc4","title":"OEM Carrier Transformer 120V–24V 40VA for UPFLOW100U48M19A","description":"\u003ch1\u003eOEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for Model UPFLOW100U48M19A\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM control transformer for the \u003cstrong\u003eCarrier UPFLOW100U48M19A\u003c\/strong\u003e upflow gas furnace. The transformer steps down 120V line voltage to a safe 24V (with 12V tap) to power the entire low-voltage control circuit — including the thermostat, ignition board, gas valve, and zone controls. When this transformer fails, the result is total control loss: a blank thermostat display, an unresponsive furnace, or a tripped internal fuse with no obvious cause. Electrical surges, short circuits in the control wiring, and normal wear are the most common causes of failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V Primary | 24V \/ 12V Secondary | 40VA Rating | Factory OEM — Part # HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier Factory Authorized Part, manufactured to exact VA and voltage tolerances. Generic transformers may run outside spec, risking nuisance tripped fuses, under-voltage to the control board, or premature failure — all of which complicate diagnostics and extend downtime.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off power at the breaker and confirm zero voltage before proceeding. Tools needed: multimeter (verify secondary output is 24–26V after install), flat-head and Phillips screwdrivers, needle-nose pliers, wire nuts or spade connectors. Always check low-voltage wiring for shorts before installing the new transformer — an unresolved short will blow the new unit immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM Carrier factory warranty. In-stock orders ship same business day from our warehouse. Free shipping on qualifying orders.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eUPFLOW100U48M19A\u003c\/strong\u003e upflow gas furnace. Verify your existing transformer's primary\/secondary voltage and VA rating against your unit data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you buy for peace of mind.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640238985587,"sku":"CARRIE-UPFLOW100U48M19A-TRANSFORMER-HT01CN001","price":353.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640239018355,"sku":"CARRIE-UPFLOW100U48M19A-TRANSFORMER-HT01CN001-GEN","price":311.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN001_ed4bc2ed-20ed-469e-9465-65df3e20b65c.jpg?v=1775041108","url":"https:\/\/nationalhvacparts.com\/products\/carrier-upflow100u48m19a-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}